First, draw the missing line to finish the triangle using a ruler. Second, color the corners red. Third, draw another triangle.
First, use your ruler to draw 2 lines to make a square. Second, color the corners red. Third, draw another square.
4+1=
_____=2+1
3+2=
____=5+0
5-1=
____=4-1
3-2=
____=3-0